1 #ifndef __LINUX_NET_SCM_H
2 #define __LINUX_NET_SCM_H
4 #include <linux/limits.h>
6 #include <linux/security.h>
8 #include <linux/nsproxy.h>
10 /* Well, we should have at least one descriptor open
11 * to accept passed FDs 8)
13 #define SCM_MAX_FD 253
18 struct file *fp[SCM_MAX_FD];
22 struct pid *pid; /* Skb credentials */
23 const struct cred *cred;
24 struct scm_fp_list *fp; /* Passed files */
25 struct ucred creds; /* Skb credentials */
26 #ifdef CONFIG_SECURITY_NETWORK
27 u32 secid; /* Passed security ID */
31 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
32 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
33 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
34 extern void __scm_destroy(struct scm_cookie *scm);
35 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
37 #ifdef CONFIG_SECURITY_NETWORK
38 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
40 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
43 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
45 #endif /* CONFIG_SECURITY_NETWORK */
47 static __inline__ void scm_set_cred(struct scm_cookie *scm,
48 struct pid *pid, const struct cred *cred)
50 scm->pid = get_pid(pid);
51 scm->cred = cred ? get_cred(cred) : NULL;
52 cred_to_ucred(pid, cred, &scm->creds);
55 static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
65 static __inline__ void scm_destroy(struct scm_cookie *scm)
67 scm_destroy_cred(scm);
72 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
73 struct scm_cookie *scm)
75 memset(scm, 0, sizeof(*scm));
76 unix_get_peersec_dgram(sock, scm);
77 if (msg->msg_controllen <= 0)
79 return __scm_send(sock, msg, scm);
82 #ifdef CONFIG_SECURITY_NETWORK
83 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
89 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
90 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
93 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
94 security_release_secctx(secdata, seclen);
99 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
101 #endif /* CONFIG_SECURITY_NETWORK */
103 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
104 struct scm_cookie *scm, int flags)
106 if (!msg->msg_control) {
107 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
108 msg->msg_flags |= MSG_CTRUNC;
113 if (test_bit(SOCK_PASSCRED, &sock->flags))
114 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
116 scm_destroy_cred(scm);
118 scm_passec(sock, msg, scm);
123 scm_detach_fds(msg, scm);
127 #endif /* __LINUX_NET_SCM_H */